873843821 has 4 divisors (see below), whose sum is σ = 873904032. Its totient is φ = 873783612.

The previous prime is 873843797. The next prime is 873843823. The reversal of 873843821 is 128348378.

It is a happy number.

873843821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 873843821 - 2¹⁰ = 873842797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (873843823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6506 + ... + 42308.

It is an arithmetic number, because the mean of its divisors is an integer number (218476008).

Almost surely, 2^873843821 is an apocalyptic number.

It is an amenable number.

873843821 is a deficient number, since it is larger than the sum of its proper divisors (60211).

873843821 is a wasteful number, since it uses less digits than its factorization.

873843821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60210.

The product of its digits is 258048, while the sum is 44.

The square root of 873843821 is about 29560.8494634373. The cubic root of 873843821 is about 956.0441312500.

The spelling of 873843821 in words is "eight hundred seventy-three million, eight hundred forty-three thousand, eight hundred twenty-one".